function base64_encode(str) {
		var c1, c2, c3;
		var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
		var i = 0, len = str.length, string = '';

		while (i < len) {
				c1 = str.charCodeAt(i++) & 0xff;
				if (i == len) {
						string += base64EncodeChars.charAt(c1 >> 2);
						string += base64EncodeChars.charAt((c1 & 0x3) << 4);
						string += "==";
						break;
				}
				c2 = str.charCodeAt(i++);
				if (i == len) {
						string += base64EncodeChars.charAt(c1 >> 2);
						string += base64EncodeChars.charAt(((c1 & 0x3) << 4)
								| ((c2 & 0xF0) >> 4));
						string += base64EncodeChars.charAt((c2 & 0xF) << 2);
						string += "=";
						break;
				}
				c3 = str.charCodeAt(i++);
				string += base64EncodeChars.charAt(c1 >> 2);
				string += base64EncodeChars.charAt(((c1 & 0x3) << 4)
						| ((c2 & 0xF0) >> 4));
				string += base64EncodeChars.charAt(((c2 & 0xF) << 2)
						| ((c3 & 0xC0) >> 6));
				string += base64EncodeChars.charAt(c3 & 0x3F)
		}
		return string
}

function base64_decode(str) {
		var c1, c2, c3, c4;
		var base64DecodeChars = new Array(-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
				-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
				-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62,
				-1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1,
				-1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
				15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1,
				26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42,
				43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1);
		var i = 0, len = str.length, string = '';

		while (i < len) {
				do {
						c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff]
				} while (i < len && c1 == -1);

				if (c1 == -1)
						break;

				do {
						c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff]
				} while (i < len && c2 == -1);

				if (c2 == -1)
						break;

				string += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));

				do {
						c3 = str.charCodeAt(i++) & 0xff;
						if (c3 == 61)
								return string;

						c3 = base64DecodeChars[c3]
				} while (i < len && c3 == -1);

				if (c3 == -1)
						break;

				string += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));

				do {
						c4 = str.charCodeAt(i++) & 0xff;
						if (c4 == 61)
								return string;
						c4 = base64DecodeChars[c4]
				} while (i < len && c4 == -1);

				if (c4 == -1)
						break;

				string += String.fromCharCode(((c3 & 0x03) << 6) | c4)
		}
		return string;
}
module.exports = {
		'base64_encode': base64_encode,
		'base64_decode': base64_decode 
};